668949228 has 36 divisors (see below), whose sum is σ = 1701095760. Its totient is φ = 221645856.

The previous prime is 668949223. The next prime is 668949247. The reversal of 668949228 is 822949866.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (668949221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49623 + ... + 61646.

It is an arithmetic number, because the mean of its divisors is an integer number (47252660).

Almost surely, 2^668949228 is an apocalyptic number.

It is an amenable number.

668949228 is an abundant number, since it is smaller than the sum of its proper divisors (1032146532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668949228 is a wasteful number, since it uses less digits than its factorization.

668949228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111446 (or 111441 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 668949228 is about 25864.0528146692. The cubic root of 668949228 is about 874.5763295335.

The spelling of 668949228 in words is "six hundred sixty-eight million, nine hundred forty-nine thousand, two hundred twenty-eight".